Ecological trends at animal husbandry nitrogen utilization

The aim of current work was a part of study for animal husbandry effects on emissions of greenhouse gases and some mitigation strategies between the end of XX and the beginning of XXI century. It’s emphasized on nitrogen (N) balance and its fluctuated values, as well as brings forward attendant factors. As a result, we deducted strong correlation models (R2> 0.89, 0.85, 0.99), as an estimator of the N2O emissions (Gg.CO2-eq), generated by manure management in relation to animal population (monogastric, ruminant, total) among the investigated middle-term periods throughout 1989 - 2011 y for the Bulgarian realities.